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OpenSolaris 2009.06 - man page for from (opensolaris section 1b)

from(1B)					     SunOS/BSD Compatibility Package Commands						  from(1B)

NAME
from - display the sender and date of newly-arrived mail messages
SYNOPSIS
/usr/ucb/from [-s sender] [username]
DESCRIPTION
The from utility prints out the mail header lines in your mailbox file to show you who your mail is from. If username is specified, user- name's mailbox is examined instead of your own.
OPTIONS
The following option is supported: -s sender Only display headers for mail sent by sender.
USAGE
See largefile(5) for the description of the behavior of from when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
FILES
/var/mail/*
ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+
SEE ALSO
biff(1B), mail(1B), attributes(5), largefile(5) SunOS 5.11 28 Jan 2004 from(1B)